Léna Mahfouf may be a star on French social media, but when she ventured into literature with the publication of a self-help guide in September, booksellers were skeptical. “A lot of them said, ‘Ah no, your book, it’s la merde, we don’t want it in our shops,’” the 22-year-old YouTuber says.

They have changed their tune, however. To the astonishment of the Parisian literary establishment, it turned out to be the bestselling book of the autumn in France. The initial 62,000 print-run of Toujours Plus (Always More) was snapped up within three weeks, and Robert Laffont, the publisher, is bringing out a further 150,000 copies to meet demand.

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